Imac no longer sees Back up drive

Hi there,
Apologies if this topic has been covered already but I have been searching through related posts and have come to the conclusion that my back up hard drive is knackered. Can someone confirm this please?
I am a photographer and keep all my images on the imac (mid 2010 27") on Aperture, backed up on a La Cie 1TB external Hard drive.
Today the Imac stopped seeing the hard drive when I switch it on, yet it sees it still in disk utility. When I tried to verify, it stated - it needed repair, yet when I tried to repair it it said - can not repair disk and recover backup.
Now the disk utility doesnt recognise the hard drive at all. I have tried it in all the USB ports with the same result.
Am I to assume that the drive has finally had it?
Is there any way that I can recover whats on it?
Yours hoping for a miracle.
Stuart

Arthur,
Many thanks,
It was your suggestion re removing the drive from the case that worked.
All I actuallly had to do was remove the plastic cover from the drive, which seems like madness to me. So I sat it naked on top of the table, plugged it back in, switched it on and voila, the icon popped up on the desktop again. Go figure!
I was however able to retrieve my files. I have now started a new backup on another drive which will take the best part of 48hrs to complete and I'll see how the old disk performs with the lid off for a while but I think its probably on its way out.
Regards
Stu

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